While audio in video is not only music, music is an important part for new videographers. Be sure to use only legal music!
By Jose Antunes | July 23, 2014
The note "Disputed third party matched content" will be the first sign that YouTube considers you audio to be used without permission
When starting in videography with a DSLR, the main problem a newcomer has is with sound. DSLR's excel at image but are absolute crap when it comes to sound, either monaural or stereo. So, the first option for someone starting on this path is to skip the sound recording at the source and think of some background music or sounds to add to the video afterwards. Choose your music widely.